Survey of oyster bottoms in Matagorda bay, Texas . ORGANISMS CONSTITUTING FOOD OF MATAGORDA BAY OYSTERS, i AFTER SCHMIDT.) Magnification 440 1-3. Coscinodiscua lineatus. 4-7. Coscinodicus excentricus. s. Coscinodiscus crassus. Plate ORGANISMS CONSTITUTING FOOD OF MATAGORDA BAY OYSTERS. 1-6. Navicula elliptica, x 660. (After 7. Pleurosigma intermedium, x 400. (After Schmidt). Smith.) 8. Pleurosigma fasciola, x 400. (After 9-11. Navicula didyma, x 660 (After Schmidt.)Smith.) OYSTER BOTTOMS IN MATAGORDA BAY. 79 merically about one-fifth, and in volume about one-eighth of theavailable oyste
Survey of oyster bottoms in Matagorda bay, Texas . ORGANISMS CONSTITUTING FOOD OF MATAGORDA BAY OYSTERS, i AFTER SCHMIDT.) Magnification 440 1-3. Coscinodiscua lineatus. 4-7. Coscinodicus excentricus. s. Coscinodiscus crassus. Plate ORGANISMS CONSTITUTING FOOD OF MATAGORDA BAY OYSTERS. 1-6. Navicula elliptica, x 660. (After 7. Pleurosigma intermedium, x 400. (After Schmidt). Smith.) 8. Pleurosigma fasciola, x 400. (After 9-11. Navicula didyma, x 660 (After Schmidt.)Smith.) OYSTER BOTTOMS IN MATAGORDA BAY. 79 merically about one-fifth, and in volume about one-eighth of theavailable oyster food. Like the preceding species, it is taken up bythe oysters in relatively large numbers, and constitutes about percent of their food. Average specimens measure in length 10 c. d. m.,breadth c. d. m., thickness c. , voTume= (lXbXt) = cu. c. d. m. Melosira distans Kutzing (pi. xi, fig. 3) is a circular diatom fre-quently aggregated by the circular faces to form filaments. It ismuch more abundant below Dog Island, and is entirety absent inLive Oak Bay and above Dressing Point. Between Mad Island andHalf Moon reefs it comprises numerically about 12 per cent, and involume over 25 per cent of the food conten
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